net: fix a memleak when uncloning an skb dst and its metadata
In the Linux kernel, the following vulnerability has been resolved: net: fix a memleak when uncloning an skb dst and its metadata When uncloning an skb dst and its associated metadata, a new dst+metadata is allocated and later replaces the old one in the skb. This is helpful to have a non-shared dst+metadata attached to a specific skb. The issue is the uncloned dst+metadata is initialized with a refcount of 1, which is increased to 2 before attaching it to the skb. When tun_dst_unclone returns, the dst+metadata is only referenced from a single place (the skb) while its refcount is 2. Its refcount will never drop to 0 (when the skb is consumed), leading to a memory leak. Fix this by removing the call to dst_hold in tun_dst_unclone, as the dst+metadata refcount is already 1.
- Published
- Jul 16, 2024
- Updated
- Jun 17, 2026
- EPSS
- 0.3% · 19th percentile
- CWE
- CWE-401
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for the hundreds of thousands of vulnerabilities in the database; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpAffected systems
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel4.3 and later · before 4.9.302
- linux linux kernel4.10 and later · before 4.14.267
- linux linux kernel4.15 and later · before 4.19.230
- linux linux kernel4.20 and later · before 5.4.180
- linux linux kernel5.5 and later · before 5.10.101
- linux linux kernel5.11 and later · before 5.15.24
- linux linux kernel5.16 and later · before 5.16.10
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 4.3affected
- fc4099f17240767554ff3a73977acb78ef615404 and later · before 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4affected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before c1ff27d100e2670b03cbfddb9117e5f9fc672540affected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before 0be943916d781df2b652793bb2d3ae4f9624c10aaffected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88affected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1affected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before fdcb263fa5cda15b8cb24a641fa2718c47605314affected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before 8b1087b998e273f07be13dcb5f3ca4c309c7f108affected · git
- fc4099f17240767554ff3a73977acb78ef615404 and later · before 9eeabdf17fa0ab75381045c867c370f4cc75a613affected · git
- before 4.3not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 5.16.10-1 | 5.16.10-1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kernel-default | before 4.12.14-122.234.1 | 4.12.14-122.234.1 |
| SUSE:Linux Enterprise Live Patching 12 SP5 | kgraft-patch-SLE12-SP5_Update_62 | before 1-8.3.1 | 1-8.3.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-source | before 4.12.14-122.234.1 | 4.12.14-122.234.1 |
| SUSE:Linux Enterprise Server 12 SP5-LTSS | kernel-syms | before 4.12.14-122.234.1 | 4.12.14-122.234.1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1 | Vendor (CNA) |
| Linux Linux | 0be943916d781df2b652793bb2d3ae4f9624c10a | Vendor (CNA) |
| Linux Linux | 4ac84498fbe84a00e7aef185e2bb3e40ce71eca4 | Vendor (CNA) |
| Linux Linux | 8b1087b998e273f07be13dcb5f3ca4c309c7f108 | Vendor (CNA) |
| Linux Linux | 9eeabdf17fa0ab75381045c867c370f4cc75a613 | Vendor (CNA) |
| Linux Linux | a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88 | Vendor (CNA) |
| Linux Linux | c1ff27d100e2670b03cbfddb9117e5f9fc672540 | Vendor (CNA) |
| Linux Linux | fdcb263fa5cda15b8cb24a641fa2718c47605314 | Vendor (CNA) |
| debian:linux | 5.16.10-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-default | 4.12.14-122.234.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | Package registry (OSV) |
| suse:kernel-source | 4.12.14-122.234.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:kernel-syms | 4.12.14-122.234.1 · SUSE:Linux Enterprise Server 12 SP5-LTSS | Package registry (OSV) |
| suse:kgraft-patch-SLE12-SP5_Update_62 | 1-8.3.1 · SUSE:Linux Enterprise Live Patching 12 SP5 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-401 · Missing Release of Memory after Effective LifetimeCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/00e6d6c3bc14dfe32824e2c515f0e0f2d6ecf2f1
- git.kernel.org/stable/c/0be943916d781df2b652793bb2d3ae4f9624c10a
- git.kernel.org/stable/c/4ac84498fbe84a00e7aef185e2bb3e40ce71eca4
- git.kernel.org/stable/c/8b1087b998e273f07be13dcb5f3ca4c309c7f108
- git.kernel.org/stable/c/9eeabdf17fa0ab75381045c867c370f4cc75a613
- git.kernel.org/stable/c/a80817adc2a4c1ba26a7aa5f3ed886e4a18dff88
- git.kernel.org/stable/c/c1ff27d100e2670b03cbfddb9117e5f9fc672540
- git.kernel.org/stable/c/fdcb263fa5cda15b8cb24a641fa2718c47605314
Vendor advisories and official records. Exploit/PoC links are deliberately left out.